My first Audi - 2001.5 S4 with Custom Single Turbo setup...

[uponone nogaro]

looking good british

[britishturbo]

Headed home with an RS4 engine...

[topquarkpc]

ever get some pic of your fx400 clutch? just checking...

[jibberjive]

Did you ever figure out the compression height of the stock pistons?

[britishturbo]

Did you ever figure out the compression height of the stock pistons?

I will check today for ya.

[britishturbo]

Audi porn lol




So I guess I should run the RS4 heads on the temp motor now then? :-)

[michael66899]

Headed home with an RS4 engine...

Yes! That's awesome I'll be very interested to see Cosworth's take on 5 valve port geometry... they might have about the same inlet dimension as the 2.8 heads but they are a far different beast.

[britishturbo]

Yes! That's awesome I'll be very interested to see Cosworth's take on 5 valve port geometry... they might have about the same inlet dimension as the 2.8 heads but they are a far different beast.

Yeah the opening of the port is the only dimension the 2.8 and rs4 heads share.
The RS4 port is actually very very similar to the 2.7 port I have designed. I'll see how close when I digitize the RS4 port.

[falkor923]

Hmm, I've been trying to find a comparison of AZR to APB ever since the APB/BEL debate began.

[britishturbo]

Hmm, I've been trying to find a comparison of AZR to APB ever since the APB/BEL debate began.

The AZR block is very different from the APB. its a lot more than the few differences people think...

[ravensB5S4]

The AZR block is very different from the APB. its a lot more than the few differences people think...

Such a tease..... :P.

[Brodyaga]

British!!!! spill the beans!!!!!!! lol

[topquarkpc]

I will check today for ya.

awe...you're awesome...

[falkor923]

The AZR block is very different from the APB. its a lot more than the few differences people think...

As you dig in, please try to share pics and notes. Have always wanted to know.

Edit: Also, if you guys get together, I'm showing up too..Im like 2-4 hrs away from everything md to pa to ny!

[britishturbo]

As you dig in, please try to share pics and notes. Have always wanted to know.

Edit: Also, if you guys get together, I'm showing up too..Im like 2-4 hrs away from everything md to pa to ny!

I will fully document the block and everything that's different on it. It's pretty much a fully assembled short block as this point so hopefully the weekend I'll strip it down and show the details!

And for sure, I hope everyone shows up!

[britishturbo]

Such a tease..... :P.

British!!!! spill the beans!!!!!!! lol

lol the weekend I'll take a bunch of pics as I tear it down... but the block really is very different on the outside, didn't expect that.

[britishturbo]

It's always a tough day when you can't decide weather to run RS4 heads of port matched 2.8 heads on your temp motor... Hmmmm



On another note my office looks like an Audi Shop! lol

[Monty23]

I think I'm going to start piling blocks and heads in my office and see what my boss says lmao!!!

[falkor923]

It's always a tough day when you can't decide weather to run RS4 heads of port matched 2.8 heads on your temp motor... Hmmmm

Decide by midnight.....or all heads will turn into pumpkins!

I THINK I would save the 2.8 for the main scooby, and run the RS4 just because I'd be curious. But I don't know. lol

[britishturbo]

Decide by midnight.....or all heads will turn into pumpkins!

I THINK I would save the 2.8 for the main scooby, and run the RS4 just because I'd be curious. But I don't know. lol

Well I already have another set of 2.8 heads that are out west getting valve jobs right now lol. Sooooo I dunno.

[falkor923]

Well I already have another set of 2.8 heads that are out west getting valve jobs right now lol. Sooooo I dunno.

They gonna be +1 intake? If so, I'd toss the 2.8s you have now on the temp motor!

[britishturbo]

They gonna be +1 intake? If so, I'd toss the 2.8s you have now on the temp motor!

Yepp the heads already cnc'd are getting +1mm intake and exhaust.
The 2.8 heads on the floor are stock size.

I'm thinking of going with the 2.8
The RS4 heads I have things planned for...

[034Motorsport]

Coolant ports should be smaller on the RS4 heads. Will you be cutting any of them up?

Ummmmm....since when? I tried buying arp's for head studs but they didn't make them. Something I'll upgrade when shoving 40psi down the block I guess.

They were only recently made available; previously Raceware was the only option.

The ARP's are much cheaper and a quality item. We carry them too.

[getslideways]

It's always a tough day when you can't decide weather to run RS4 heads of port matched 2.8 heads on your temp motor... Hmmmm

1st world problems... lol

Keep up the great work British. I think i speak for everyone when i say we appreciate your contributions of research, pics, and knowledge to the B5S4 community!

[britishturbo]

1st world problems... lol

Keep up the great work British. I think i speak for everyone when i say we appreciate your contributions of research, pics, and knowledge to the B5S4 community!

Haha "1st world problems" was the first thing that pooped into my head too!

Cheers!

[britishturbo]

Coolant ports should be smaller on the RS4 heads. Will you be cutting any of them up?

Won't be cutting up the RS$ heads... they are in good shape so too valuable for me to use for R&D haha.
But I would love to get a junk one to cut up.

[DxC]

Some members on here are in Europe, maybe they can go to a scrapyard and find rs4 heads

[britishturbo]

Some members on here are in Europe, maybe they can go to a scrapyard and find rs4 heads

I'm going to ask my family and friends to check as well lol ;-)

[britishturbo]

Moonlighting:

[britishturbo]

Doing some preliminary digitizing on the RS4 heads:

[TweetsS4Estate]

Doing some preliminary digitizing on the RS4 heads:

Have the RS4s ports been touched or are they just SUPER clean?
Edit:never mind... They aren't, I zoomed in.

[britishturbo]

Have the RS4s ports been touched or are they just SUPER clean?
Edit:never mind... They aren't, I zoomed in.

They are dirty but have been hand polished with a sanding roll... Cosworth either cleaned up the castings by hand or did cnc porting of the castings and then cleaned them up. But they have been smoothed out throughout the port.
Once I get them hot tanked I'll show you.

[TweetsS4Estate]

They are dirty but have been hand polished with a sanding roll... Cosworth either cleaned up the castings by hand or did cnc porting of the castings and then cleaned them up. But they have been smoothed out throughout the port.
Once I get them hot tanked I'll show you.

My goodness they are a classy company.

[britishturbo]

A little something I whipped up tonight:











It's a transition piece to allow a stock S4 manifold to be used on 2.8/RS4 heads.

[TweetsS4Estate]

Nice! And adds runner length! A lot of people tapered the old VAST phenolic spacers like that (in a much more crude fashion)

[britishturbo]

Nice! And adds runner length! A lot of people tapered the old VAST phenolic spacers like that (in a much more crude fashion)

The manifold with have half or the transition itself. So it will be nice and smooth.

[britishturbo]

RS4 Heads stripped down ready to go get hot tanked:

[TweetsS4Estate]

Man, don't they "look" ported..? Wierd

[3L beater]

All the RS4 guys use 2.4 heads you need to get a set ASAP

[laserb5]

Actually found an eBay seller who would sell and ship a full 2.4 here for around $500.